Charles e



0. E. CHINNOOK. Induced Current Guard for Electrical Conductors.

No. 224,580. Patented Feb. 17, I880.

UNITED STATES.

PATENT OFFICE.

CHARLES E. CHINNOCK, OF BROOKLYN, NEW YORK, ASSIGNOR OF ONE HALF OF HISRIGHT TO JOHN D. HARRISON, OF NEWARK, N. J.

INDUCED-CURRENT GUARD FOR ELECTRICAL CONDUCTORS.

SPECIFICATION forming part of Letters Patent No. 224,5Q0, dated February17, 1880.

Appllcltion filed December 24, 1879- TO all whom it may concern Be itknown that I, CHARLES E. Gnmnoox, of Brooklyn, in Kings county, andState of New York, have-invented certain new and useful Improvements inElectrical Conductors, of which the followingis a specification.

The object of my invention is to obviate induced and escaping currentsfrom reaching line wires or conductors in telegraphs or telephones andinterfering with. messages sought to be transmitted through the same.

The invention is especially advantageous for telephones, thoughapplicable also to telegraphs.

The invention consists in the combination of insulators sustaining linewires or conductors and supports therefor, in electrical com-.munication with each other through a guard or other wire or wirescommon. to said supports, and in communication with the ground, whereby,in a simple manner, provision is afforded for carrying 011' escaping orinduced currents at various points.

It also consists in the combination, with insulators sustainingline-wires and supported on shanks or fingers of wood or other suit-ablematerial, of conductors applied to said shanks or fingers, a wireconnecting the conductors of these shanks or fingers, and a wireconnecting the last said wire with a guard or other wire incommunication with the ground, whereby a simple and convenient means ofaccomplishing the desired end is attained.

The accompanying drawing represents a pole and two line-wires and aguard-wire and appurtenances supported thereby embodying my invention.

A designates a pole, which may be erected in the ground, on a house-top,or in or upon any other suitable support, and provided with a crossbar,B. O designates insulators, which may be of glass or other suitablematerial and of the ordinary or any other appropriate form. They arefitted upon the ends of shanks or fingers l), of wood or other material,inserted in the cross-bar B, and conductors or a conductor applied tothe pole or cross-bar or to the shanks or lingers D serve or serves tointercept any electric currents induced or escaping from an outsidepoint or source of electricity and prevent the same from reaching theinsulators O and passing thence to the line-wires E, which they support,so as to interfere with the electric currents transmitted through thesame and impair the clenrness of the message conveyed by such currents.'lhesc line-wires E are connected to the insulators by being wrappedaround grooves in them, or otherwise.

Although the insulators should intercept induccd or escaping currentsfrom an outside source, yet 'in practice they become moistor carbonizedby smoke from passing trains or adjacent fires, and hence partiallyconductive,therefore the need of more effective means for interceptingthe induced or escaping currents.

As here shown, 1 apply electrical conductors G, consisting of coils orcylinders of sheet metal or metallic foil, between the shanks 0r lingersD and the cross-bar B; but these condoctors do not extend to theinsulators C.

vThe two conductors G, as here shown, are

connected by a wire, H, and this who is connected by a wire, I, to aguurd-wiro,1, extendingalong the tops of the pole A, and others of itskind, and supported on insulators C. The guard-wire K is to be connectedwith the ground at proper points-as, for instance, by a wire, Jand thusit will, besides serving to prevent the contact of undesirable articles,such as crossing line-wires with the line-wires E, serve to carry oh theinduced or escaping currents intercepted by the conductors G. A wire notforming a guard-wire could. of course, be used.

In lieu of this construction, cncn conductor G may. be connecteddirectly with the guardwire K, or to a ground-wire, and one 00!]- ductorarranged to intercept induced or es caping currents passing towardeither linewire E, and connected to the guard-wire K; or a ground-wiremay be utilized,

It will be seen that by my invention 1 pro vide a simple and elfectivenicu us of intercepting induced or escaping currents and precluding themfrom interfering with the proper transmission of messages or impairingthe enunciation of the messages.

It is obvious that aniron or other metallic pole, or an iron cross-bar,or both, with wooden \Vh'at I claim as my invention, and desire. tosecure by Letters Patent, is-

1. The combination of insulators sustaining v line wires or conductorsand supports therefor,

in electrical coinnmnloation with each other through a guard or otherwire or WllQS common to said supports, and in communication at snitablepoints with the ground.

2. The combination, with insulators sustaining line-wires and supportedon shanks or fingers of wood or other suit-able material, of conductorsapplied to the shanks or fingers, a wire connecting the conductors ofthese shanks or fingers, and a wire connecting the last said -wire. witha guard orother wire in communication with the ground, substantially asand for the purpose specified.

' C. E. OHINNOOK. Witnesses:

EDWIN H. BROWN, '1. J. KEANF

